mining: add getMemoryLoad capnp definition and test coverage

Author: Sjors

capnp/mining.capnp

@@ -23,6 +23,7 @@ interface Mining $Proxy.wrap("interfaces::Mining") {
     createNewBlock @4 (context :Proxy.Context, options: BlockCreateOptions, cooldown: Bool = true) -> (result: BlockTemplate);
     checkBlock @5 (context :Proxy.Context, block: Data, options: BlockCheckOptions) -> (reason: Text, debug: Text, result: Bool);
     interrupt @6 () -> ();
+    getMemoryLoad @7 (context :Proxy.Context) -> (result: MemoryLoad);
 }
 
 interface BlockTemplate $Proxy.wrap("interfaces::BlockTemplate") {
@@ -44,6 +45,10 @@ struct BlockCreateOptions $Proxy.wrap("node::BlockCreateOptions") {
     coinbaseOutputMaxAdditionalSigops @2 :UInt64 = .defaultCoinbaseOutputMaxAdditionalSigops $Proxy.name("coinbase_output_max_additional_sigops");
 }
 
+struct MemoryLoad $Proxy.wrap("interfaces::MemoryLoad") {
+    usage @0 :UInt64;
+}
+
 struct BlockWaitOptions $Proxy.wrap("node::BlockWaitOptions") {
     timeout @0 : Float64 = .maxDouble $Proxy.name("timeout");
     feeThreshold @1 : Int64 = .maxMoney $Proxy.name("fee_threshold");

tests/test.rs

@@ -182,7 +182,7 @@ fn mining_constants() {
     );
 }
 
-/// isTestChain, isInitialBlockDownload, getTip.
+/// isTestChain, isInitialBlockDownload, getTip, getMemoryLoad.
 #[tokio::test]
 #[serial_test::parallel]
 async fn mining_basic_queries() {
@@ -216,6 +216,13 @@ async fn mining_basic_queries() {
             let tip_hash = tip.get_hash().unwrap();
             assert_eq!(tip_hash.len(), 32, "block hash must be 32 bytes");
             assert!(tip.get_height() >= 0, "height must be non-negative");
+
+            // getMemoryLoad
+            let mut req = mining.get_memory_load_request();
+            req.get().get_context().unwrap().set_thread(thread.clone());
+            let resp = req.send().promise.await.unwrap();
+            let memory_load = resp.get().unwrap().get_result().unwrap();
+            let _usage: u64 = memory_load.get_usage();
         })
         .await;
 }